Read All Teams Chats

mark_teams_chats_as_read.js

/*
 * MS Teams lacks a "mark all as read" function, and doing it manually is arduous. 
 * This is the start of userscript to do it automatically. (for teams.microsoft.com)
 * 
 * Teams 'lazy-loads' chats, so click the filter search, then the elipses, and sort by unread. 
 * Next, scroll to the bottom of your unread chats. Then you can run this script.
 */

function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}  

async function readAllChats() {
    var unreadItems = document.querySelectorAll("a.left-rail-unread.ts-unread-channel");
    for (index=0; index < unreadItems.length; index++) {
        console.info("autoclicking the chat: %s", unreadItems[index].title);
        unreadItems[index].click();
        await sleep(1700);
    }
}

readAllChats()

/* Why did you write it like this?
 * - Why click them one by one? 
 * The teams client doesn't tell the server to mark the thread 'read' until the contents have loaded in the client.
 * It can take over a second to load the thread.
 * I havent found how to call the method to tell the server to mark it read directly.
 * 
 * - Why the iteration variable loop?
 * if you want to use a promise for sleep, you can't use a .foreach()
 * I don't know javascript 
 *
 * - Why do i have to manually click the filter + sort by new thing
 * I haven't spent the time to script the filter/sortbynew
*/

Where is this executed?

in the javascript console of the web browser. I haven't been keeping it up to date so it might need some modifications to get it working, and also I think the new teams has a feature to do this